Etymology

pia mater

Today it means: The innermost of the meninges, the membranes that surround the brain and spinal cord. Full definition →

Medieval Latin pia māter
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The story

  1. Medieval Latin · borrowed frompia māter
  2. English todaypia mater

From Medieval Latin pia māter (literally “tender mother”).

Etymology from Wiktionary, CC BY-SA 4.0.